Method and machine for manufacturing paper tubes, especially conical tubes



May 18, 1937. c. MAJER 2,030,619

METHOD AND MACHINE FOR MANUFACTURING PAPER TUBES, ESPECIALLY CONICAL TUBES I Filed June 1, 1934 3 Sheets-Sheet l May 18, 1937. c; MAJER METHOD AND MACHINE FOR MANUFACTURING PAPER TUBES, ESPECIALLY CONICAL TUBES Filed June- 1, 1954 3 Sheets-Sheet 2 May 18, 1937. c, MAJER v 2,080,619

METHOD AND MACHINEFOR MANUFACTURING PAPER TUBES, ESPECIALLY CONICAL TUBES Filed June 1, 1934 5 Sheets-Sheet 5 E E i Hi I I, I

E r" H 5 i: i 1:; g I II l I I H: I i :I I 1:: i

Patented May 18, 1937 PATENT OFFICE" METHOD AND MACHINE FOR MANUFAC- TURING PAPER TUBES, ESPECIALLY CONI- CAL TUBES Christian Majer, Tubingen, Germany '7 Application June'l, 1934, Serial No. 728,511 In Germany February 18, 1933 14 Claims.

This invention relates to a method and machine for the automatic manufacturing of paper tubes, espe ially tubes of any conicity.

The met od is characterized by the fact that the segment shaped or angular sheets or cut strips for winding the tubes are successively cut transversely to the paper web so that the centres of the segment-shaped or angular sections are situated near or in the longitudinal axis of the paper web. The lines of severance of the sheet cut off from the end of the paper web form the tangents to the segment are. The front lines of severance of the severed sheet standing at an angle to one another form the beginning of the tube winding and the end joint of the tube. The edges forming the beginning and end of the winding are skived before the I severing of the segment sheet in order to obtain smooth outer and inner surfaces on the tube.

The machine consists substantially of the skiving, severing and winding devices. The skiving device comprises two skiving elements adjustable at an angle the one to the other and arranged wardly directed apertures by means of which the skived winding edge of the sheet issucked tightly on to the winding mandrel during the winding operation.

At the same time the sheet is pressed on to the winding mandrel by a presser which is so constructed that the sheet is not pressed on along a line but only on a portion of the periphery of the winding mandrel. After the sucking on of the paper sheet and the winding of the paper tube the suction ceases and compressed air is fed into the winding mandrel which air is forced through between the mandrel and the finished wound tube, so that the tube easily becomes detached from the mandrel. In the case of conical tubes the compressed air acts as an absolutely automatic tube stripper, the tube being detached from and blown off the mandrel.

The winding mandrel is in connection with trimming devices which cut off the ends of the tube during the winding operation.

By means of the method and machine paper tubes bf any conicity can be directly produced from a paper web with very little waste of paper.

Moreover, by suitable adjustment of the skiving, severing and winding devices cylindrical tubes can be produced on the machine.

A machine for carrying out the method for the automatic manufacturing of thick-walled paper tubes, especially tubes of any conicity is illustrated by way of example in the accompanying drawings in which:

Fig. 1 shows the machine in side elevation.

Fig. 2 is a top plan view of Fig. 1.

Fig. 2a is a side elevation partly in section showing the feeding device for the severed paper sheet.

Fig. 3 shows in elevation the winding device with trimming device.

Fig. 3a is a part elevation of a modified form of construction of the trimming device.

Fig. 3b is a part elevation showing the suctio and blowing device.

Fig. 4 is a front elevation of Fig. 3 with pasting device.

Fig. 5 is a cross section through the Winding -mandrel.

Fig. 5a. is a crosssection through a modified form .of construction.

Fig. 6 shows a longitudinal section of the winding spindle in blowing position.

Fig. 7 shows a longitudinal section of the winding spindle in suctionposition.

Fig. 8 is a cross section on line A-B of Fig. 6 on an enlarged scale.

Fig. 9 is a cross section on on an enlarged scale.

Fig. 10 is a part longitudinal section of the winding spindle on an enlarged scale, during the blowing off of the finished Wound tube.

Fig. 11 is a diagrammatic top plan View illusrating the winding of cylindrical tubes.

The machine comprises substantially skiving devices I, a severing device 2, and a winding device 3, all of which are adjustably mounted on a machine frame 4.

The paper roll 5, from which the paper web 6 is fed by a pair of feed rolls 6a, 6b to the individual devices, is mounted at one end of the machine frame 4.

The skiving devices comprise electric motors8 with the external rotors which are easily adjustable without affecting the power transmission. The rotary outer casing l of the motor is constructed as a grinding wheel and coated with grinding material. The rigid base 8 of the motor is adjustable at any angle on the machine frame 4. Two such skiving devices I are arranged on the machine frame and can be mutually adjusted to the actual cutting angle. Pressing bars 9 are arranged above the rotary casings I of the elecline CD of Fig. 6

tric motors 8, by means of which bars the paper web 3 is pressed at certain intervals against the grinding cylinders 1 for skivingthe edges [3. The moving paper web-3 is pressed against the grinding cylinders 1 only until the edges Ill. are 5 formed. The bars 3 are pivotally mounted on axles II which are periodically actuated by levers l2 and a rod system not illustrated in detail.-

The skiving devices are arranged at distances apart one behind the other, the distances being determined by the size of the segment I3 to be cut off. The skiving devices may also be arranged the one opposite the other. -The severing device 2 is arranged in front of the grinding devices. The severing device comprises two knives I3 which can be mutually adjusted at any angle on a frame l4. Behind the knives l3 an arm 43 is mounted on the frame I4 which arm carries on its under side a" cylindrical knife 44 designed for cutting out a circular aperture 19. The frame I4 is vertically shiftable in bearings [3, so that during the lowering of the frame l4 the segment sheet I3 is severed from the paper web 3., The movement of the frame I4 is eflected by levers I1 and I8. At the same time as the. sheet I6 is severed the circular aperture I3 is cut out, the centre 20 of which the radius of the segment are 2] or of the angular section is situated. The knives l3 are adjusted so that the cutting lines 22 form the tangents to the segment'arc 2 I. The

centre 20 is situated in the Icentral'longitudinal axis of the paper web 6. A suction mouthpiece 48, by means of which the severed sheet is securely held, becomes operative shortly before the severing of the segment sheet 2|. Fig. 2a. The

suction mouthpiece 43 is arranged below the paper web and communicates by a tube 33 with a suction pump not shown on the drawings. The suction mouthpiece 48 is fixed on a carriage 3| which is guided in a guide 52. The carriage 3| is moved by levers 33, 55 under the influence of a cam 54.

The'lever 55 is pressed against the cam 34 by a spring 3|. In the known winding machines the sheet was held and fed to the winding mandrel by mechanically actuated tongs instead of by the '45 suction mouthpiece 43. This arrangement'cannot, however, be employed on the machine according to the invention because the. upper half of the tongs would be in the way of the elements for preparing the sheets. The sucking on of the sheet by the suction mouthpiece ensures a reliable holding of-the sheet for feeding to the winding mandrel, which is of great importance for accurate winding."

After the sheet I3 has been severed from the paper web, it is fed with the skived edge I of one side to the winding 'mandrel 23 and pressed against the same by a presser 21.- The presser 21 is so constructed, that it presses the sheet not only along a line but on a portion of the circumoo ference against the winding mandrel 23. For this purpose a plin'ality of arms 21 are mounted on a bar 21a, which arms are curved to correspond with the mandrel 23. The winding mandrel 23 and its spindle 24 are hollow and communicate 5 with a suctionblower. The bore 23 of the winding mandrel communicates with outwardly extending suction apertures 23. Thus, the sheet I3, after being pressed against the winding mandrel 23, is held thereon by suction. The adhesion 7o between the paper sheet and the winding mandrel 23 is considerably increased by the presser 21 because the sheet I3 is pressed along its entire length at a certain angle on to, the surface of the winding mandrel. The pressers 21 may be of any.

75 construction. According to Fig. 5 they are fixed on a bar 21a whichis moved the winding mandrel 23. The pressers .21. may

'also be connected with a lever 21b whichis oscillatabie about a pin 31 in front of the winding mandrel 23. During the winding of the sheet 5- the tube is trimmed at one end by the trimming device '23 and at the other end by a-- circular knife 29. The trimming device 23 eoi'nprisesa pivotally mounted lever 33 carrying onlone end a rotatable circular knife 41 which cooperates with 10 a counter knife 43 or 43a. Th knife 43. is stationary whereas the knife 43ais \circular knife. Figs. 3 and 3a. A disc 43 is rotatably mounted on a lever 33 behind the knife 41 and runs on the windings of the tube. The other knife 23 ro- 15 tatably mounted in a holder 32. The outer end 33 of the winding mandrel 23 is removable in order to prevent the whole winding mandrel from being damaged by the trimming. The knives 23 and 41 are pressed on to the winding mandrel 23 during the winding operation. After the winding and trimming of the tube the knives 23 and 41 are lifted oil the winding mandrel. The knife 23 is lifted from the winding mandrel 23 and the knife 41 with the disc 43 by pulling down 25 I the rod 31 in the direction of the arrow 33. The

actuation of the presser and also the lifting of the knives 23 and 41 is effected automatically by levers and cams not shown in the drawings. Dured at its outer end and raised and lowered by this 40,

movement so that by raising the lever 43 the rotatable arm 33 is likewise lifted. If the blank 1 I3 is to be brought into the correct position relatively to the winding mandrel 23,v the lever 43 is lowered until the outer end of the arm 33 45 against the blank I3. By horizontally turning the arm 33 theblank "is adjusted into the correct position relatively to the winding mandrel. The winding mandrel 23 with its spindle 24 may also be constructed in such a manner that, dur 50 ing the winding operation, the hollow spindle 24..

is connected with a suction pipe 33 and after-the Paper sheet l3 has been sucked on to the mandrel.

and wound to form a finished paper tube compressed air is forced into the winding mandrel 5 23 through a conduit 33 for detaching the tube from the mandrel. The longitudinal bore 23 otthe mandrel 23 communicates with radial suction and blowing apertures 23. On the spindle 24 an intermediate element 32 is mounted which carries the winding mandrel 23 at one endand isprovided with a valve seat 33 at the other-end.

In the spindle 24 a tube 34 is shiftable in longitudinal direction and has a smaller diameter than the bore of the spindle 24 that between 65. the tube 34 and the spindle 2 a space 33 is- Inthetube34avalve1lisarrangedpr0vlded13 the tube 64 is guided. A cap 19 is loosely slipped on to the sleeve 18 and provided with a pipe nipple 80 through which compressed air is fed. The cap 19 closes the rear end of the hollow spindle 24 and is continually pressed on to the sleeve 18 of the spindle 24 by a spring 8|. The spring 8| bears against a counter bearing 82. The valve stem 12 is controlled by a rod system or the like influenced by a cam. By exerting pressure on the end of the valve stem 12 the tube 64 with the extension 10 is pressed on to the valve seat 63. As soon as the extension 10 bears against the valve'seat 63, the valve H is lifted from its seat 13, against the action of the spring 15. By this operation the suction space 65 is closed and the hollow winding mandrel brought into communication with the compressed air conduit 80 (Fig, 6) In this position the compressed air is blown through the radial bores 26 of the mandrel 23 so that the finished wound tube 83 is detached from and blown oii the mandrel. By pulling back the valve rod 12 the valve H is first pressed on to the seat 13 and the compressed air conduit closed. When the rod 12 is pulled further back the extension 10 serving as valve is lifted from the seat 63 so that the suction conduit 66 again communicates with the winding mandrel 23. The pipe nipples 66 and 80 are connected with suction and pressure pumps by pipes.

For winding cylindrical tubes the skiving device 1 and the knife l3 are set at right angles to the paper web 6. A cylindrical winding mandrel is substituted for a conical mandrel.

I claim:-

1. A method for manufacturing paper tubes, especially tubes of any conicity, the sheets for which are cut from a paper web and wound, consisting in skiving sections of the paper web at predetermined distances apart from both sides of the web towards the middle at an angle transversely to the paper web, in cutting the web along these skived portions into sheets of polygonal shape with a central hole one behind the other in the length of the web with their centre substantially in the middle of the web, and in winding these sheets commencing at one of the skived edges.

2. A method as specified in claim 1, in which the skived edges of each following blank in the web coinciding with a portion of the contour of the preceding blank, and the edges of one side of the sheet form the commencement of the tube winding and the opposite edge forms the end join of the tube.

3. A method as specified in claim 1, in which the edges forming the beginning and end of the winding are ski'ved at intervals during the feeding of the paper web.

4. A machine for automatically manufacturing paper tubes, especially tubes of any conicity, comprising in combination a paper web feed, two

separate skiving devices arranged at an angle to the paper web feed one on each side of the machine, means for periodically pressing the paper web against said skiving devices to produce skived portions extending from the two sides of the web and converging towards the middle of the web,

- a cutting device adapted to cut the web along said skived portions to form polygonal sheets, and a winding mandrel adapted, to wind said sheets in conical tubeb ans for feeding the cut sheets to sai xii d n ,f W I 5. A machi I ,as'./ specified in claim 4, in which each skiving device comprises an electric motor having an external rotor constructed as a grinding wheel, against which the web is pressed at intervals by a bar.

6. A machine as specified in claim 4, in which the cutting device comprises a frame extending transversely across the paper web, a circular knife in the middle of said frame adapted to cut a circular aperture in the web at the point of intersection of the skive'd portions, and two straight knives adjustable at an angle to one another on said frame and adapted to cut the web along the skived portions to the aperture cut by said circular knife.

'7. A machine as specified in claim 4 in which the means for feeding the sheets to the winding mandrel, comprises in combination a hollow bar under the cut paper segments and provided with section apertures, a guide, a carriage mounted on said guide carrying said bar, a lever system adapted to reciprocate said carriage, and a cam adapted to actuate said lever system.

8. A machine as specified in claim 4, including a hollow spindle extending from the winding mandrel and having holes in its wall, a suction conduit connected with said hollow spindle, a compressed air conduit connected with said spindle, and reversing means in said spindle adapted to simultaneously control said'conduits to alternately connect said mandrel with said suction conduit to draw in air through the holes in its wall and suck and hold the paper sheets against the mandrel during the winding and with said compressed air conduit to force airthrough the holes in its wall and detach the wound tube from the mandrel.

9. A machine as specified in claim 4, including a hollow spindle extending from the winding mandrel, a suction conduit connected with said hollow spindle, a compressed air conduit connected with said spindle, and a valve in said spindle adapted to connect said suction conduit with said mandrel to hold the sheets on the mandrel during the winding operation, a second valve in said spindle adapted to connect said compressed air conduit with said mandrel to detach the wound tube therefrom, and means for simultaneously controlling said two valves.

10. A machine as specified in claim 4, including a hollow spindle carrying the mandrel, a sleeve slidable in longitudinal direction in said hollow spindle, a longitudinally bored valve head on the front end of said sleeve, a suction conduit normally communicating with said valve head, a valve seat in said sleeve, a positively controlled valve rod extending through said valve seat, a valve cone on one end of said rod, a spring in said sleeve acting upon said rod, and a compressed air con-duit communicating with the rear end of said sleeve, said rod adapted to shift said sleeve and said valve head towards said mandrel to close said suction conduit and to push said valve cone off said valve seat against the action of said spring to establish communication between said compressed conduit and said mandrel through said sleeve, said valve seat and the longitudinal bore in said valve head.

11. A machine as specified in claim 4, in which the mandrel has-suction apertures, and a member provided adjacent the mandrel to press the beginning of the-sheet on the portion of the circumference of the mandrel adjacent the suction apertures to ensure the sheet being firmly held on the mandrel by suction.

'12; A machine as specified in claim 4 including means for trimming the ends of the wound conical-tubes, comprising in combination with the mandrel, circular knives one near each end of 'said mandrel, and a counter kniie arranged laterally at the wide end of the mandrel cooperating with thecircular knife at this end of the mandrel to cut the end of the tube during the winding.

13. A machine as specified in claim 4 including means for trimming the ends of the wound conical tubes, comprising in combination with the mandrel, circular knives one near each end of said mandrel, a counter knife arranged laterally at the wide end' of the mandrel cooperating with thecircular knife at this end of the mandrel, and V removable extensions on the narrow end of said mandrel cooperating'with the circular knife at this end of the mandrel, said circular knives,

counter knife and extension adapted to turn the ends of the tube during the winding operation/ 14. A machine for automatically manufacturing paper tubes, especially tubespfany' conicity, comprising in combination apa'per web feed, two. 5 separate skiving devices arranged at an angle to the paper web feed one on each side of the machine and each comprising an electric motor having an external rotor constructed as a grinding wheel, means for adjusting said devices at 10 right angles to the paper web, means for periodically pressing the paper web against said skiving devices to produce skived portions extending from the two sides of the web and converging towards the middle of the web, a cutting device adapted to cut the web along said skived portions to form polygonal sheets, said cutting device comprising a frame extending transversely across the paper web and carrying a central circular knife and two straight knives one on each 'side of said circular knife, means for adjusting said straight knives at right angles to the paper web,.and a winding mandrel adapted to wind said sheets in conical tubes, and means for feeding the cut sheets to said mandrel. u

CHRISTIAN MAJER. 1 

